<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../../assets/logo.png" alt="">
      </div>
      <el-form class="login_form" :model="loginForm" :rules='loginFormRules' ref="loginFormRef">
          <!-- 用户名 -->
          <el-form-item prop="username">
            <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username" ></el-input>
          </el-form-item>
          <!-- 密码 -->
          <el-form-item prop="password">
            <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type='password'></el-input>
          </el-form-item>
          <!-- 按钮区域 -->
          <el-form-item class="btns">
            <el-button type="primary" @click="login()" >登录</el-button>
            <el-button type="info" @click="resetLoginForm()">重置</el-button>
          </el-form-item>

        </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'login',
  data() {
    return {
      // 登录表单数据绑定
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    login() {
      this.$refs.loginFormRef.validate(valid => {
        if (!valid) return this.$message.error('登录失败')
        this.$http.post('login', this.loginForm).then(res => {
          if (res.data.meta.status !== 200) {
            this.$message.error('登录失败，用户名或者密码错误')
          } else {
            this.$message.success('登录成功')
            // 登录成功后，要把服务器分配的token保存到客户端的sessionStorage里（因为只在网页打开的时候才生效）
            // 项目中其他的api必须登陆后才能访问
            window.sessionStorage.setItem('token', res.data.data.token)
            // 通过编程式导航跳转到后台主页，路由地址是/admin
            this.$router.push('/home')
          }
        })
      })
    },
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    }
  }
}
</script>

<style lang="stylus" scoped>
.login_container
  height 100% vh
  background-color: #2b4b6b;
  .login_box
    position absolute
    left 50%
    top 50%
    transform translate(-50%,-50%)
    width 450px
    height 300px
    background-color #fff
    border-radius 3px
    .avatar_box
      position absolute
      left 50%
      transform translate(-50%,-40%)
      width 130px
      height 130px
      padding 5px
      border 1px solid #eeeeee
      box-shadow 0 0 10px #ddd
      border-radius 50%
      background-color #fff
      img
        width 100%
        height 100%
        border-radius 50%
        background-color #eee
    .login_form
      position absolute
      bottom 0
      width 100%
      padding 0 20px
      box-sizing border-box
      .btns
        display flex
        justify-content flex-end
</style>
